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scsi: target: Fix iscsi transport id buffer setup

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This fixes the following bugs with the transport id setup for iscsi:

 1. Incorrectly adding NULL after initiator name for TPID format 1.

 2. For TPID format 1 buffer setup we are doing off+len, off++ and then
    also len+=some_value. This results in the isid going past buffer
    boundaries when we then do buf[off+len]

 3. The pr_reg_isid is the isid in string format which is 12 bytes, but we
    are only copying 6 bytes.

Link: https://lore.kernel.org/r/1593654203-12442-6-git-send-email-michael.christie@oracle.com
Signed-off-by: Mike Christie <michael.christie@oracle.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Mike Christie 2020-07-01 20:43:21 -05:00 committed by Martin K. Petersen
parent 169622eee4
commit a6f9b6cee3
1 changed files with 35 additions and 37 deletions
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72
drivers/target/target_core_fabric_lib.c
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@ -136,29 +136,22 @@ static int iscsi_get_pr_transport_id(
spin_lock_irq(&se_nacl->nacl_sess_lock);
/*
* From spc4r17 Section 7.5.4.6: TransportID for initiator
* ports using SCSI over iSCSI.
* Only null terminate the last field.
*
* The null-terminated, null-padded (see 4.4.2) ISCSI NAME field
* shall contain the iSCSI name of an iSCSI initiator node (see
* RFC 3720). The first ISCSI NAME field byte containing an ASCII
* null character terminates the ISCSI NAME field without regard for
* the specified length of the iSCSI TransportID or the contents of
* the ADDITIONAL LENGTH field.
* From spc4r37 section 7.6.4.6: TransportID for initiator ports using
* SCSI over iSCSI.
*
* Table 507 TPID=0 Initiator device TransportID
*
* The null-terminated, null-padded (see 4.3.2) ISCSI NAME field shall
* contain the iSCSI name of an iSCSI initiator node (see RFC 7143).
* The first ISCSI NAME field byte containing an ASCII null character
* terminates the ISCSI NAME field without regard for the specified
* length of the iSCSI TransportID or the contents of the ADDITIONAL
* LENGTH field.
*/
len = sprintf(&buf[off], "%s", se_nacl->initiatorname);
/*
* Add Extra byte for NULL terminator
*/
len++;
/*
* If there is ISID present with the registration and *format code == 1
* 1, use iSCSI Initiator port TransportID format.
*
* Otherwise use iSCSI Initiator device TransportID format that
* does not contain the ASCII encoded iSCSI Initiator iSID value
* provied by the iSCSi Initiator during the iSCSI login process.
*/
off += len;
if ((*format_code == 1) && (pr_reg->isid_present_at_reg)) {
/*
* Set FORMAT CODE 01b for iSCSI Initiator port TransportID
@ -166,8 +159,12 @@ static int iscsi_get_pr_transport_id(
*/
buf[0] |= 0x40;
/*
* From spc4r17 Section 7.5.4.6: TransportID for initiator
* ports using SCSI over iSCSI. Table 390
* From spc4r37 Section 7.6.4.6
*
* Table 508 TPID=1 Initiator port TransportID.
*
* The ISCSI NAME field shall not be null-terminated
* (see 4.3.2) and shall not be padded.
*
* The SEPARATOR field shall contain the five ASCII
* characters ",i,0x".
@ -177,23 +174,24 @@ static int iscsi_get_pr_transport_id(
* (see RFC 3720) in the form of ASCII characters that are the
* hexadecimal digits converted from the binary iSCSI initiator
* session identifier value. The first ISCSI INITIATOR SESSION
* ID field byte containing an ASCII null character
* ID field byte containing an ASCII null character terminates
* the ISCSI INITIATOR SESSION ID field without regard for the
* specified length of the iSCSI TransportID or the contents
* of the ADDITIONAL LENGTH field.
*/
buf[off+len] = 0x2c; off++; /* ASCII Character: "," */
buf[off+len] = 0x69; off++; /* ASCII Character: "i" */
buf[off+len] = 0x2c; off++; /* ASCII Character: "," */
buf[off+len] = 0x30; off++; /* ASCII Character: "0" */
buf[off+len] = 0x78; off++; /* ASCII Character: "x" */
len += 5;
buf[off+len] = pr_reg->pr_reg_isid[0]; off++;
buf[off+len] = pr_reg->pr_reg_isid[1]; off++;
buf[off+len] = pr_reg->pr_reg_isid[2]; off++;
buf[off+len] = pr_reg->pr_reg_isid[3]; off++;
buf[off+len] = pr_reg->pr_reg_isid[4]; off++;
buf[off+len] = pr_reg->pr_reg_isid[5]; off++;
buf[off+len] = '\0'; off++;
len += 7;
buf[off++] = 0x2c; /* ASCII Character: "," */
buf[off++] = 0x69; /* ASCII Character: "i" */
buf[off++] = 0x2c; /* ASCII Character: "," */
buf[off++] = 0x30; /* ASCII Character: "0" */
buf[off++] = 0x78; /* ASCII Character: "x" */
memcpy(buf + off, pr_reg->pr_reg_isid, 12);
off += 12;
len += 17;
}
buf[off] = '\0';
len += 1;
spin_unlock_irq(&se_nacl->nacl_sess_lock);
/*
* The ADDITIONAL LENGTH field specifies the number of bytes that follow